/******************************************************************************
 * Copyright (c) 2008-2012 Transmission authors and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#import "BlocklistScheduler.h"
#import "BlocklistDownloader.h"

//thirty second delay before running after option is changed
#define SMALL_DELAY 30

//update one week after previous update
#define FULL_WAIT (60 * 60 * 24 * 7)

@interface BlocklistScheduler (Private)

- (void)runUpdater;

@end

@implementation BlocklistScheduler

BlocklistScheduler* fScheduler = nil;

+ (BlocklistScheduler*)scheduler
{
    if (!fScheduler)
    {
        fScheduler = [[BlocklistScheduler alloc] init];
    }

    return fScheduler;
}

- (void)updateSchedule
{
    if (BlocklistDownloader.isRunning)
        return;

    [self cancelSchedule];

    NSString* blocklistURL;
    if (![NSUserDefaults.standardUserDefaults boolForKey:@"BlocklistNew"] ||
        !((blocklistURL = [NSUserDefaults.standardUserDefaults stringForKey:@"BlocklistURL"]) && ![blocklistURL isEqualToString:@""]) ||
        ![NSUserDefaults.standardUserDefaults boolForKey:@"BlocklistAutoUpdate"])
    {
        return;
    }

    NSDate* lastUpdateDate = [NSUserDefaults.standardUserDefaults objectForKey:@"BlocklistNewLastUpdate"];
    if (lastUpdateDate)
    {
        lastUpdateDate = [lastUpdateDate dateByAddingTimeInterval:FULL_WAIT];
    }
    NSDate* closeDate = [NSDate dateWithTimeIntervalSinceNow:SMALL_DELAY];

    NSDate* useDate = lastUpdateDate ? [lastUpdateDate laterDate:closeDate] : closeDate;

    fTimer = [[NSTimer alloc] initWithFireDate:useDate interval:0 target:self selector:@selector(runUpdater) userInfo:nil
                                       repeats:NO];

    //current run loop usually means a second update won't work
    NSRunLoop* loop = NSRunLoop.mainRunLoop;
    [loop addTimer:fTimer forMode:NSDefaultRunLoopMode];
    [loop addTimer:fTimer forMode:NSModalPanelRunLoopMode];
    [loop addTimer:fTimer forMode:NSEventTrackingRunLoopMode];
}

- (void)cancelSchedule
{
    [fTimer invalidate];
    fTimer = nil;
}

@end

@implementation BlocklistScheduler (Private)

- (void)runUpdater
{
    fTimer = nil;
    [BlocklistDownloader downloader];
}

@end
